feat(学生): 添加学生课程查询功能

- 后端添加获取学生课程列表的API路由
- 实现Course模型中的findByStudentId方法查询学生课程
- 新增学生控制器的getCourses方法处理课程请求
- 前端添加课程表格展示及刷新功能

backend/controllers/studentController.js

@@ -30,6 +30,20 @@ class StudentController {
             error(res, '服务器错误');
         }
     }
+
+    static async getCourses(req, res) {
+        try {
+            const userId = req.session.user.id;
+            const data = await StudentService.getStudentCourses(userId);
+            success(res, data);
+        } catch (err) {
+            if (err.message === '学生信息不存在') {
+                return error(res, err.message, 404);
+            }
+            console.error('Get Courses Error:', err);
+            error(res, '服务器错误');
+        }
+    }
 }
 
 module.exports = StudentController;

backend/models/Course.js

@@ -12,6 +12,19 @@ class Course {
         const rows = await db.query('SELECT * FROM courses WHERE id = ?', [id]);
         return rows[0];
     }
+
+    static async findByStudentId(studentId) {
+        const sql = `
+            SELECT c.*, u.name as teacher_name
+            FROM courses c
+            JOIN classes cl ON c.class_id = cl.id
+            JOIN students s ON cl.class_name = s.class
+            JOIN users u ON c.teacher_id = u.id
+            WHERE s.id = ?
+            ORDER BY c.course_code
+        `;
+        return await db.query(sql, [studentId]);
+    }
 }
 
 module.exports = Course;

backend/routes/student.js

@@ -5,5 +5,6 @@ const { requireAuth, requireRole } = require('../middleware/auth');
 
 router.get('/grades', requireAuth, requireRole(['student']), StudentController.getGrades);
 router.get('/grades/:id', requireAuth, requireRole(['student']), StudentController.getGradeDetails);
+router.get('/courses', requireAuth, requireRole(['student']), StudentController.getCourses);
 
 module.exports = router;

backend/services/studentService.js

@@ -1,12 +1,9 @@
 const Score = require('../models/Score');
 const Student = require('../models/Student');
+const Course = require('../models/Course');
 
 class StudentService {
     static async getStudentGrades(userId) {
-        // 先通过 userId 获取 studentId
-        // 假设 users.id = students.id，或者通过 user_id 关联
-        // 根据之前的 authService，我们假设 users.id 就是 students.id
-        
         // 确认学生是否存在
         const student = await Student.findById(userId);
         if (!student) {
@@ -50,6 +47,14 @@ class StudentService {
         }
         return grade;
     }
+
+    static async getStudentCourses(userId) {
+        const student = await Student.findById(userId);
+        if (!student) {
+            throw new Error('学生信息不存在');
+        }
+        return await Course.findByStudentId(userId);
+    }
 }
 
-module.exports = StudentService;
+module.exports = StudentService;